Plant and Soil

, Volume 282, Issue 1–2, pp 361–378 | Cite as

Hydraulic Lift in Cork Oak Trees in a Savannah-Type Mediterranean Ecosystem and its Contribution to the Local Water Balance

  • Cathy Kurz-Besson
  • Dennis Otieno
  • Raquel Lobo do Vale
  • Rolf Siegwolf
  • Markus Schmidt
  • Alastair Herd
  • Carla Nogueira
  • Teresa Soares David
  • Jorge Soares David
  • John Tenhunen
  • João Santos Pereira
  • Manuela Chaves
Article

Abstract

The aim of this study was to identify the sources and depth of water uptake by 15-years old Quercus  suber L. trees in southern Portugal under a Mediterranean climate, measuring δ18O and δD in the soil–plant-atmosphere continuum. Evidence for hydraulic lift was substantiated by the daily fluctuations observed in Ψs at 0.4 and 1 m depth and supported by similar δ18O values found in tree xylem sap, soil water in the rhizosphere and groundwater. From 0.25 m down to a depth of 1 m, δD trends differed according to vegetation type, showing a more depleted value in soil water collected under the evergreen trees (−47‰) than under dead grasses (−35‰). The hypothesis of a fractionation process occurring in the soil due to diffusion of water vapour in the dry soil is proposed to explain the more depleted soil δD signature observed under trees. Hydraulically lifted water was estimated to account for 17–81% of the water used during the following day by tree transpiration at the peak of the drought season, i.e., 0.1–14 L tree−1 day−1. Significant relationships found between xylem sap isotopic composition and leaf water potential in early September emphasized the positive impact of the redistribution of groundwater in the rhizosphere on tree water status.

Keywords

δ18hydraulic lift Quercus  suber root biomass soil δD fractionation soil water potential 

Abbreviations

hydraulic lift

(HL)

leaf water potential

L)

soil temperature

(TS)

soil water content

(SWC)

soil water potential

S)

vapour pressure deficit

(VPD)

tree transpiration

(E)

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Copyright information

© Springer 2006

Authors and Affiliations

  • Cathy Kurz-Besson
    • 1
  • Dennis Otieno
    • 3
  • Raquel Lobo do Vale
    • 1
  • Rolf Siegwolf
    • 2
  • Markus Schmidt
    • 3
  • Alastair Herd
    • 1
  • Carla Nogueira
    • 1
  • Teresa Soares David
    • 4
  • Jorge Soares David
    • 1
  • John Tenhunen
    • 3
  • João Santos Pereira
    • 1
  • Manuela Chaves
    • 1
    • 5
  1. 1.Instituto Superior de AgronomiaLisboaPortugal
  2. 2.Laboratory of Atmospheric ChemistryPaul Scherrer InstituteVilligen-PSISwitzerland
  3. 3.Department of Plant EcologyUniversity of BayreuthBayreuthGermany
  4. 4.Estação Florestal NacionalINIAPOeirasPortugal
  5. 5.Instituto de Tecnologia Química e BiológicaOeirasPortugal

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